
    //______________________________________________________________________  
    // Read information from xml file.  
      
    // define xml file path, as follow , we use relative path,  
    // but you can use absolute path also.  
    const char* filepath = "phonebookdata.xml";  
    TiXmlDocument doc(filepath);  
    bool loadOkay = doc.LoadFile();  
    // faile to load 'phonebookdata.xml'.  
    if (!loadOkay) {      
        printf( "Could not load test file %s. Error='%s'. Exiting.\n", filepath,doc.ErrorDesc() );  
        exit( 1 );  
    }  
      
    // get dom root of 'phonebookdata.xml', here root should be 'phonebook'.  
    TiXmlElement* root = doc.RootElement();  
      
    printf("_______________________________________\n\n");  
    printf("     contacted person information      \n\n");  
    // trace every items below root.  
    for( TiXmlNode*  item = root->FirstChild( "item" );  
             item;  
             item = item->NextSibling( "item" ) ) {  
        printf("_______________________________________\n");  
      
        // read name.  
        TiXmlNode* child = item->FirstChild();  
        const char* name = child->ToElement()->GetText();  
        if (name) {  
            printf("name:%s\n",name);  
        } else {  
            printf("name:\n");  
        }  
      
        // read address.  
        child = item->IterateChildren(child);  
        const char* addr = child->ToElement()->GetText();  
        if (addr) {  
            printf("addr:%s\n",addr);  
        } else {  
            printf("addr:\n");  
        }  
      
      
        // read telephone no.  
        child = item->IterateChildren(child);  
        const char* tel = child->ToElement()->GetText();  
            if (tel) {  
            printf("tel:%s\n",tel);  
        } else {  
            printf("tel:\n");  
        }  
      
        // read e-mail.  
        child = item->IterateChildren(child);  
        const char* email = child->ToElement()->GetText();  
        if(email) {  
            printf("email:%s\n",email);  
        } else {  
            printf("email:\n");  
        }  
          
        printf("\n");  
      
    }  
    //______________________________________________________________________  
      
      
    //______________________________________________________________________  
    // Add information to xml file and save it.  
    TiXmlElement* writeRoot = doc.RootElement();  
    TiXmlNode* newNode = new TiXmlElement("item");  
      
       const TiXmlNode* name4NewNode = new TiXmlElement("name");  
    newNode->InsertEndChild(*name4NewNode)->InsertEndChild(TiXmlText("pipi"));  
      
    const TiXmlNode* addr4NewNode = new TiXmlElement("addr");  
    newNode->InsertEndChild(*addr4NewNode)->InsertEndChild(TiXmlText("Shaanxi Xianyang"));  
      
    const TiXmlNode* tel4NewNode = new TiXmlElement("tel");  
    newNode->InsertEndChild(*tel4NewNode)->InsertEndChild(TiXmlText("02937310627"));  
      
    const TiXmlNode* email4NewNode = new TiXmlElement("email");  
    newNode->InsertEndChild(*email4NewNode)->InsertEndChild(TiXmlText("pipi@home.com"));  
      
    writeRoot->InsertEndChild(*newNode);  
    doc.SaveFile();  
    //______________________________________________________________________  